Calling all 500 owners past and present

[gowen]

Help! I'm wondering about my mixing ratio as I mix my fuel/oil at 32:1 with Benol or Super Techniplate (both my Klotz) thinking I may need to change as I'm getting alot of smoke and no idle, and no jetting is NOT the issue (worked on it for a year :yikes: )

Question: What ratio are you running and what type of oil are you using.

Me: 32:1 using mainly any Castor based oil. Sometimes H1R by bel-ray.

Thanks guys..

 

[Studboy]

Gowen, if it won't idle, it may be something more than just your jets. Like a dirty carb, weak spark, or something dragging maybe?

 

[BigSwole]

I have been using PJ1 40:1 no problems with anything.I'm at 3000 feet thou.

 

[michigan]

40:1, klotz R50

 

[Dan Post]

Castrol 40:1

 

[MXP1MP]

My friend use's maxima 927 60:1

 

[nitropimp]

Yamalube 2R with VP C 12 @ 36:1
Cylinder is still stock bore.

 

[Shig]

We ran Maxima 927 at 32:1 in a CR 500. It burns clean and smells great. I'm told that 927 will separate from gas if temps are below freezing.

 

[500guy]

A 500 does not that rich of a mixture since they are turning much lower RPMs. Assuming you use a good quality synthetic oil, you should be able to go at least 44:1, 50:1 safely.

 

[magneto]

96 CR500R. 32:1 Golden Spectro Synthetic. No problems, no smoke after it warms up.

 

[elf]

Help! I'm wondering about my mixing ratio as I mix my fuel/oil at 32:1 with Benol or Super Techniplate (both my Klotz) thinking I may need to change as I'm getting alot of smoke and no idle, and no jetting is NOT the issue (worked on it for a year :yikes:..

I have had 3 different 500s back inthe day. always used 40:1
If it worked before but doesent now maybe its something else.
Maybe a bad crank seal? sucking a little trans oil into the engine?

 

[rob129]

I am running 927 at 44:1 in my 89 CR500, no problemo. Do you have the dreaded black smooze coming from your exhaust? That might indicate a bad crank seal as well.

Rob

 

[gowen]

I am running 927 at 44:1 in my 89 CR500, no problemo. Do you have the dreaded black smooze coming from your exhaust? That might indicate a bad crank seal as well.

Rob

No spooge, not fouling plugs. Runs great except smoke and idle. Thanks for the input, I mixed 50:1 with H1R in C12. We will see how it performes.


BTW, Forword Motion just rebuilt the entire top and bottom of that bike. :cool: I hope it isn't leaking already. :yikes:

 

[vic580]

32:1 HP2 with premium,runs perfect.Like elf said maybe a crank seal? :ride:

 

[nephron]

Wait, wait, wait, wait....you said your only problems were idle and smoke (at idle, I guess). You say you've messed with jetting until the nads turned blue. It runs 'great' otherwise, I guess? If so, I doubt you could fly cleanly while sucking tranny oil into your transfers.

What have you done with the carb lately? Take the bowl off, pilot out and spray carb cleaner throughout the pilot circuit. Take some high pressure air to it, too. This is one of the many jetting woes I've chased with the PWK39.

What are your jettings specs at what altitude?

Lastly, why Benol? I think they keep the castor based oil around for diehards, but I wouldn't think it would be wise with a powervalve unless you're talking a strung out RM125 being raced 100% of its service duty. Almost any other oil type would suffice--all smoke less than benol, even if not considered low smoke. Personally Gowen, I wouldn't let a castor oil near my powervalved 500 and I hope you quit using it soon.

32:1 is where you should stay if you're jetted for that.
My bet is a pilot circuit issue that will be simple to fix. You should know by now these KX500's are easy to fix--they don't break.

What kind of port timing changes were done, or what port 'type' did you get? If low rpm signal was affected enough, you may just have to really change your pilot setup all around.

 

[LukeRips]

We ran Maxima 927 at 32:1 in a CR 500. It burns clean and smells great. I'm told that 927 will separate from gas if temps are below freezing.

I've had separation problems with 927 too Shig, I make sure to drain and store in a warm place. I ran 927 in a 2000 KX500 in the Baja500 at 32:1 with no smoke. (No unusual smoke anyway :laugh: ) We had to jet due to the FMF pipe but I dont think it was the oil that caused it.

 

[gowen]

Wait, wait, wait, wait....you said your only problems were idle and smoke (at idle, I guess). You say you've messed with jetting until the nads turned blue. It runs 'great' otherwise, I guess? If so, I doubt you could fly cleanly while sucking tranny oil into your transfers.

What have you done with the carb lately? Take the bowl off, pilot out and spray carb cleaner throughout the pilot circuit. Take some high pressure air to it, too. This is one of the many jetting woes I've chased with the PWK39.

What are your jettings specs at what altitude?

Lastly, why Benol? I think they keep the castor based oil around for diehards, but I wouldn't think it would be wise with a powervalve unless you're talking a strung out RM125 being raced 100% of its service duty. Almost any other oil type would suffice--all smoke less than benol, even if not considered low smoke. Personally Gowen, I wouldn't let a castor oil near my powervalved 500 and I hope you quit using it soon.

32:1 is where you should stay if you're jetted for that.
My bet is a pilot circuit issue that will be simple to fix. You should know by now these KX500's are easy to fix--they don't break.

What kind of port timing changes were done, or what port 'type' did you get? If low rpm signal was affected enough, you may just have to really change your pilot setup all around.

Well, I've always used a castor based oil. But, currently I have H1R mixed at 50:1 with C12. I was using Benol at 32:1 but I've drained that and at your advice will not use it again, just keep it for my cr144 eric gorr.

Here's the layout and I hope you can help me, as nobody as been able to. I had Eric (Forward Motion) do a KX520 job, ported for mid-high rpm, and on pump. I decided to have my entire motor sent for a new rod, a crank balance, bearings, and seals. I have no doubt in Eric, so I know the job was done right. :worship:

I got the bike back and wanted more top-end power, so I retarded the timing just to the notch, which helped alot.

Anyway, on to jetting. Sea Level - I have just about every pilot from size 40 all the way to a 68. Main jet from 158 to a 182.

The pilot: I'm currently on the 42. I went down to a 40 and got ALOT of surging and waaay too much touchy throttle, like sticking. Lean... On a 45, I get excessive smoke and no idle, 1/4 throttle power, just sputtering. This is with playing from closed air screw out to 2 1/2 turns, which made no difference on the 45, but a hell of a difference on the 40 with 2 1/2 turns (ran good). 42 is the key at 2 turns even. Power, little idle, runs good, alot of smoke but not excessive.

The needle: I'm currently on the 2nd notch. As the first notch is lean, being it surges, throttle is WAAAY to sensitive and almost scary as the throttle acts stuck, kinda like you are running out of gas. 3rd notch causes a sluggish response in the mid range and will barely even pull the rpm and will absolutely kill the idle to nothing. Very rich on the 3rd. 2nd seems to be the key on a stock needle.

The slide: #7. Stock: keeping to that.

The main: started with a 178, very rich, no topend, smoke no throttle response. made it eventually down 162. Throttle is killer in the WOT position. Not much smoke unless built up by trail riding or just cruising. Have gone down to a 160 and it felt great, plugs were tan, so I decided to move up to a 162 to be safe. Anything higher than a 162 is too rich, excessive smoke and bad response on the throttle.

I have also measured the float height about 100 times. So that is not the issue either. :(

Like I've said, still no idle unless the screw is all the way in and alot of smoke. I'm using an BR8EIX and have yet to foul it in 6 months. But, it is still blackish. So, I'm rich.

Have done throttle chop tests on the 162 main, and it is coming out with a ring on it, kinda dark brown. So, a little rich.

Any thoughts? :yikes:

PS: Checked powervalves too, all too often. They are free and operating fine.

 

[elf]

Sounds like you have it jetted right. And now that I know the engine is rebuilt I"m sure its not the crank seal. What baffles me is it wont idle untill you turn the airscrew in with the 42, but it wont idle with the 45. Turning the screw in on the 42 should be about = to the 45 right?
How about your idle ajustment,have you tried that? another possibility there could be something wrong with your choke?

 

[500guy]

What about your electrical components. You can spend a lot of time troubleshooting in the wrong area with a bad coil, wire, etc....

 

[gowen]

Yup, had them tested, ended up replacing the CDI and the Stator plate. :( Starts easier, but does not effect the running. :bang:

I did take it out yesterday running C12 @ 50:1 using H1R and it ran ok, but still smoked alot. Moving down to a 160 on the main helped, but still alot of smoke. Maybe should replace the oil seal anyways. Who knows.

 

[nephron]

gowen, you either have a problem with your carb itself, or you live on Mt Everest. 42? First of all, I didn't even know they existed. Secondly, I can't even start my bike with a 52! I run a 55/172/2nd notch, stock needle and slide, and use airscrew to fine tune diff days.

I really think that if you ask around, and even look at Team Green's setup, you'll find that your pilot is godawfully small, and your main's a bit thin as well. This motor likes a fat main. Look around and check it out. Destry uses 55/172/2nd notch. It works good for me when temp is approx 60-75, OK above that, but not precise.

....then again, it could be the porting that's done it. He's increased port time:area (generally speaking), and could require leaning out the bottom associated with decreased signal.

 

[gowen]

....then again, it could be the porting that's done it. He's increased port time:area (generally speaking), and could require leaning out the bottom associated with decreased signal.

I hope that is it, because most everybody else is saying the same. I need to get Eric's oppinion on this, but I hate to bother him.

I took it out the other day, 90 degrees and about 80% humidity and drove fine with alot of smoke. I moved the main down to a 160 and seemed to have a BIG impact on the power and no smoke. :clue: Also, I changed to 50:1 over H1R.

 

[nephron]

Sounds like a combination of things, really. It's amazing what a minute change can make on these big girls. I know mine's awfully sensitive--either that or I'm too anal. Hell, I won't ride mine unless I believe it's running perfectly. Sick. Even when my son rides his bike and I think there might be a slight 48 rpm bog b/t 5000-8000 rpm I'll run out, tackle him, and spend the next few hours jetting it---uh, whoops, it's time to go home... :ugg: So why do we both suck at riding again? :think:

 

[gowen]

Well, just an update, I've pretty much perfected my jetting with a 38 pilot, 158 main, and a CGK needle. Crazy huh?

 

[elf]

. Crazy huh?

Not really. You should have mentioned you had a big bore from the very begining.Glad to see you got it running good!
When I had my ktm bored to a 144 it barley ran with the stock jetting, I had to go a lot leaner.